Alot is going to depend on what barrel profile the mini has. If its the older profile its all one size from the gas block forward. If its the newer barrel it will be thicker at the gas block and thinner as you go towards the muzzle. I have a 580 series with the thin profile barrel and it shoots near MOA with my handloads at 100yrds. Its also had a few modifications. I think the thicker profile barrel version would be more popular and slightly more accurate in general.

If its mine. In like new shape. $650 for rifle and scope, give or take. $500 for rifle only, give or take. Remember, these are the better mini's after the shut down and retool of the mini plant. They are better rifles than the older versions.